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The four parameters used in counting operations for the Level 2 BLAS
are the matrix dimensions 3#3 and 4#4 and the upper and lower
bandwidths 588#588 and 589#589 for the band routines (198#198 if symmetric
or triangular). An exact count also depends slightly on the
values of the scaling factors 590#590 and 591#591, since some
common special cases (such as 592#592 and 593#593) can
be treated separately.
The count for SGBMV from the Level 2 BLAS is as follows:

| SGBMV |
multiplications: |
594#594 |

| |
additions: |
594#594 |

| |
total flops: |
595#595 |

plus 3#3 multiplies if
596#596 and another 3#3
multiplies if
597#597 or 53#53.
The other Level 2 BLAS operation counts are shown in
Table 1.

Susan Blackford
2001-08-13